Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1997-03-17
1999-03-23
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
2505593, 356 11, G01J 120
Patent
active
058863400
ABSTRACT:
An automatic focusing apparatus includes a telephotographic system and a line sensor comprising multiple light receiving devices which receive light of an object image formed by the telephotographic system, multiple monitor sensors positioned adjacent to said line sensor, which monitor a quantity of light received by the line sensor, and a focus detecting device which controls a light receiving time of the light receiving devices in accordance with the monitor sensors, and detects a focusing state based on outputs of respective light receiving devices. When the focus detecting device fails to detect an effective focusing state, the light receiving time of the line sensor is controlled only by the monitor sensor positioned at a center.
REFERENCES:
patent: 4394569 (1983-07-01), Nakamura
patent: 4485303 (1984-11-01), Suzuki
patent: 4491402 (1985-01-01), Suzuki
patent: 5483318 (1996-01-01), Hamada et al.
patent: 5530514 (1996-06-01), Lisson et al.
patent: 5664236 (1997-09-01), Utagawa
Nakata Masahiro
Suzuki Shin'ichi
Asahi Kogaku Kogyo Kabushiki Kaisha
Le Que T.
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